Data is only one part of the investigative story. In Part 5 of our series on investigative journalism, we look at different methods of gathering evidence

Covert operations for a journalistic investigation should be undertaken as a last resort only. In Part 4 of our series on investigative journalism, we explore the best ways to go undercover

Data-driven journalism is an increasingly integral part of investigative reporting. We look at the ways to put it to best use.